Using Microcontroller Logic For Sensing Technology

Using Microcontroller Logic For Sensing Technology

Mechanical and capacitive sliders have the ability to select a set-point when the finger stops moving and/or retracts from the slider. Similarly, there are several intuitive human gestures for selecting a set-point on a touchless slider. In the touchless environment, a pause, or a press and/or a retract may be interpreted as set-point selection.

The MCU logic can easily identify this as a set-point gesture and compute the location of the selection by comparing the relative values of reflectivity. Similarly, a push or retract motion on the z-axis would result in a simultaneous rise or fall in both reflectivity values and again, the MCU logic can easily identify these gestures in real-time. The z-axis capability is a distinct touchless slider advantage. A Ferris wheel scrolling gesture for adjusting the channel or volume is an intuitive motion implementation of z-axis measurement.

The firmware tracks the motion of a hand with visible blue LEDs and recognizes the pause set-point gesture with a single blinking blue LED. The hardware implementation is capable of flick left/right gestures.

The QuickSense Studio development tool allows developers to quickly and easily configure infrared and capacitive sensors through a library of application programming interfaces (APIs). The QuickSense Studio offers a real-time monitoring and adjustment tool that enables a developer to thoroughly understand and optimize the user interface, including the touchless slider.

The creative among you may observe that the same system can be constructed with multiple sensors and a single Ir LED for ultra low-power implementations. Infrared LEDs consume a considerable level of power; however, the Silicon Labs Si1120 device sports an ultra-high sensitivity photo-diode that offers a low active duty cycle Ir LED drive. The controlled on-time enables active infrared reflectivity sensing at just a few milliamperes on average.

For developers with more ambitious interface requirements, a radial version of the touchless slider can be implemented by adding one additional Ir LED on a second axis. The radial touchless slider unlocks the door to additional gestures, such as circular motion or even a spiral-inward and outward motion.

With regard to the alarm clock, I eagerly await a technology-based improvement to my 5:30 AM mood. I will raise my glass to toast the developer of the first commercially developed alarm clock with a touchless slider snooze control. Once you have it developed, please email me; I would like to install an early prototype at my bedside.

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